我想在使用复选框删除数据之前显示确认消息

Question

I have a problem displaying the confirmation message before deleting a data

if(isset($_POST['del'])){
        echo "
            <script>
                var x;
                    x = confirm ('You want to proceed deleting?');

                    if(x == true){";
            for($i=0;$i<$_SESSION['count'];$i++){
            $checkbox = $_POST['checkbox'];
            $del_id = $checkbox[$i];
            $query = mysql_query("SELECT picture FROM tblreserve WHERE id='$del_id'");
            while($row = mysql_fetch_assoc($query)){
                $del_pic = $row['picture'];
            }
            $sql = "DELETE FROM tblreserve WHERE id = $del_id";
            $result = mysql_query($sql);
            if($result){
                if(is_file($del_pic)){
                        unlink($del_pic);
            }
    }
    }
    header('location:view.php');

                    echo "}
                    else{
                        location.href = 'view.php';
                        }
                    </script>";
    }

Answer 1

When the confirmation box prompted in your browser, all your php code is all parse in the file. Delete the data in mysql is via php, so you want to confirm this by clicking the javascript prompted button, you should refresh your page by sending a tag in from url, or you can implement it via ajax. In you given snippet, php can not be halted there by the javascript confirm. You should know one is server end, the other is client-end